Fuel economizer



May 19,1925. 1,538,256

F. MUNZINGER FUEL ECONOMIZER Filed Sept. 3, 1921 2 Sheets-Sheet 1 May 19, 1925.

1,538,256 F. MUNZINGER FUEL ECONOMIZER Filed Sept. 5, 1921 2 Sheets-Sheet' 2 Italy, July 6, 1920 Patented May 19, 1925.

UNITED STATES PATENT OFFIC FRIEDRICH MUNZINGER, OF BERLIN, GERMANY,

ELEKTRICITATS-GESELLSCHAFT,

ASSIGNOR TO THE FIRM ALLGEMEINE OF BERLIN, GERMANY.

FUEL ECONOMIZER.

Application filed September To all whom it may concern: Be it known that I, FRIEDRICH MiiNzIN- GER, a citizen of Germany, residing at Berlin, Germany, have invented certaln new and useful Improvement-s 1n Fuel.

Economizers (for which I have filed applications in Germany, October 7, 1915, No. 302,351; GreatBritain, May 15, 1920; No. 143,27 Czechoslovakia, June 8. 1920; France, July 10, 1920, No. 520,213; Austria, July 12, 1920; Hungary, December 28, 1920; Poland, January 21, 1921; Netherlands, January 24, 1921), of which the following is a specification.

y invention refers to fuel economizers or feed water heaters of the class which comprise upper and lower headers and a series of vertical circulating tubes connecting each lower header with the corresponding upper header. It is an object of the present invention toimprove the mechanical construction and arrangement of this type of fuel economize In economizersof the class above specified as hitherto constructed the vertical circulating tubes are of uniform length and the headers are juxtaposed either in contact with or in comparatively close proximity of one another whereby a throttling effect is exerted upon the heating gases. This might be avoided by spacin the tubular members together with the hea ers farther apart, but then the velocity of the gases would be unduly diminished whereby the quantity of heat absorbed in the unit of time would be badly influenced.

In order to oboziate these drawbacks and to provide for a sufiiciently' wide passage between the headers without spacing the tubes further apart, I employ tubes of different length'arranged in such manner that their upper ends which are oonnected'with the upper headers are disposed all on one level, the upper headers providing a gas tight closure, while the lower ends of the tubes and the lower headers connected thereto are arranged at different levels, whereby the gases are allowed a free passage between the lower headers and tubes in close contact veloci In t e drawings aflixed to this specification and forming part thereof two modifications of an economizer embodying my 111- therewith and at equa 8, 1921. Ser1al 1i'o. 498,526.

vention are illustrated diagrammatically by way of examples. In the drawings- (Iiigure 1 is a vertical longitudinal section, an

Figure 2 is-a vertical cross section of an economizer in which the gases enter from below and after having passed through between the circulating tubes, leave the economizer again through a bottom flue.

Figures 3 and 4 are similar views showing a modification in which the gases enter and leave the device through openings provided in the top end thereof.

Referring first to Figs. 1 and 2 of the drawings, a is the masonry wall of the economizer chamber and b is a central partition the upper end of which is spaced apart from the top wall and which divides the chamber in two compartments 0 and d which are in communication by way of the passage e above the partition. The gases enter at f and leave at g as shown by the arrows.

k, k are the vertical circulating tubes, Z, Z are the upper headers disposed in the top wall in close juxtaposition, thus providing a gas-tight closure. p is a main collecting the water from the upper headers.

The vertical tubes differ in length, rows of longer tubes is alternating with rows of shorter tubes Each row of longer tubes k is connected with a lower header m, while each row of shorter tubes is is connected with a lower header n. Owing to the diiferent length of the tubes I: and 7c, respectively, the lower headers m and n are located on different levels, their hornzontal collecting tubes t, t being connected by As can easily be seen from the. drawing, although the vertical circulating tubes are not spaced farther apart than in the devices hitherto in use, the entrance afi'orded to the gases into the space filled with tubes and their esca e therefrom are tated by the lower' headers being arranged in staggered relation.

In the-modification illustrated in Figs. 3 and 4 the'partition 6' extends from the top wall down to the base portion of the economizer. The entrance and exhaust ports f, g are arran d in the top part of the side walls and t e transverse passage e connecting the two chambers c d below the lower h aders. 'k is an ash-pit closing the greatly facilichambers below and having an opening 71 arranged therein. In all other respects the arrangement of parts is the same as explained in connection with. Figs. 1 and 2. The gases enter at f and leave at g, the staggered arrangement of the lower headers providing a free and easy passage.

1 wish it to be understood that I do not desire to be limited to the exact details of construction shown and described for obvious modifications will occur to a person skilled in the art I claim 1. Fuel economizer comprising in combination, juxtaposed rows of substantially vertical circulating tubes, the tubes in alternating rows differing in length, the upper ends of all the tubes being disposed at the same level, justaposed upper headers arranged in close contact with one another connecting the upper ends of said rows of tubes, lower headers connecting the lower ends and being disposed at two difierent levels and means for causing heating gases to travel length- Wise of said tubes and toenter and leave between the lower headers.

2. Fuel economizer comprising in combination, a chamber, a central partition subdividing said chamber so as to form a U- shaped passage, juxtaposed rows of substantially vertical circulating tubes in either branch of said passage, the tubes in alternating rows difl'ereing in length, a series of juxtaposed headers arranged all on one level in close contact with one another and connecting one end of all the tubes, two series of headers arranged on two different levels connecting the other ends of said tubes, and means for causing hot gases to travel lengthwise of said tubes through said U-s'haped passage, so as to enter and leave between said staggered headers.

In testimony whereof I affix my signature.

FRIEDRICH MUNZINGER. 

